Steel retainer



Aug. 15, 1939. J. F. MOCK STEEL RETAINER Filed Jan. 8, 1938 H I5ATTORNEY Patented Aug. 15, 1939 eATsNT or ies 2,169,921 I STEEL RETAINERJohn F. Mock, Phillipsburg, Ingersoll-Rand Company,

N, J., assignor to Jersey City, N. J., a

corporationof New Jersey ApplicationJanuary 8, 1938, Serial No. 183,941lClaims. (01. 279-195 This invention relates to rock drills, and moreparticularly to steel retainers. for. rock drills of which the workingimplement and the elements actuating it are capable of reciprocatorymovement independently of each other. 1

One object of the invention is to assurethe retention of the workingimplement in the-rock drill.

Another object is to enable theworking imple- 1 ment to be quicklyinserted. into or-removed fromv the rock drill. y

Another object is to'equip therock drill with a rugged retaining devicecapable of fully withstanding the severe usage to which it issubjectedin practice. Still another object is to minimize the number of partsthat will be afiecte-d by the wear incident to' the impact of theworking implement against the retaining device.

Other objects will be in part obvious and in part pointed outhereinafter.

In the drawing accompanying .this specification and in which similarreference numerals refer to similar parts, l 25 Figure 1 is' anelevation, partly in section, of the front end of a rock drill equippedwith a steel retainer constructed in accordance with the practice of theinvention,

Figure 2 is a side elevation of the retainer and 30 the front end of arock drill to which it is applied, and

Figure 3 is a transverse view taken through Figure 1 on the line 3-3looking in the direction indicated by the arrows. 35 Referring moreparticularly to the drawing, 20 designates, in general, the front end ofa rock drill comprising a front head 2| and a cylinder 22 whichconstitute casing parts of the rock drill and may be secured together inany well known manner.

The cylinder 22 is bored to form a piston chamber 23 containing, apiston 24 of the reciprocatory hammer type which may be actuated bypressure fluid valved to the extremities of the piston chamber 23 bysuitable valve mechanism (not shown). In the front end of the cylinder22 is a bore 25 to receive, slidably, an anvil block 26 which transmitsthe blows of the hammer piston 24 to a working implement 21 50 of whichthe shank 28 is guided by a bore 29 in the front head 2| and abuts theanvil block 26. The working implement 21 may be in the form of a drillsteel having a collar 30, at the juncture of the shank 28 and the bodyportion 3| of the drill steel, which lies within an enlarged bore tendinto the rock drill.

32 in the front end of the front head and, in the fullyretractedposition of the drill steel, abuts the inner end surface 33 of the bore32 to limit the distance which the drill steel may ex- The bore 32 is ofample depth so that the collar is capable of a considerable degreev ofmovement longitudinally of the front head without moving out of the bore32.

In accordance with the practice of the invention, the front head isprovided near its front end with an aperture 34 of rectangular shapewhich extends longitudinally of the front head and, accommodates aretaining member 35 for retaining the working implement 2'! within thefront head. The rearward or upper end 3% of the aperture 34 preferablycoincides with the end surface33 of the bore 32 and the front end of theaperture lies perpendicular to the axis of the front head andconstitutes a fiat seating surface 31 for the retaining member 35'which, accordingly, is provided at its front end with a fiat surface 38to engage the seating surface 3'1.

The retaining member 35 has a portion 39 extending intothe bore 32 intothe path of movement of the collar 30 which, when the working implement21 is projected forwardly, engages the rearward end 40 of the portion 39and is thereby prevented from being expelled from the front head. Theportion 39 partly encircles the working implement and on the front endthereof is a forwardly extending projection 4! which, in the retainingposition of the member 35, lies against the surface of the bore 32 toprevent the retaining member 35 from being thrust out of the aperture 34by the force of the working implement.

The retaining member is slidable in the aperture 34 of which the sides42 serve as guides for the sides of the retaining member, and on theportion of the retaining member projecting exteriorly of the aperture 34are grip members 43 which maybe grasped by the operator for manipulatingthe retaining member into and out of the retaining positions.

' Preferably the retaining member is attached to the front head 2| sothat it will at all times be substantially in the correct position withrespect to the elements wherewith it is normally associated. To this endan extension 44 is provided on the upper surface of the retaining memberand has an oblong slot 45 through which extends a rod or bolt 46 whichserves as a pivot for the retaining member and is secured to the fronthead. The uppermost end of the extension 44 constitutes a seatingsurface 41 for a plunger 48 arranged slidably in a bore 49 in the fronthead and urged against the surface 4'! by a spring 50, also arranged inthe bore 49.

In the operation of the drill, whenever it is desired to remove a drillsteel from the front head the retaining member 35 is elevated in theaperture 34 by manual pressure applied to the grip members 43. Theretaining member is thereby moved to a position in which the projection4'! may pass over the seating surface 31 to permit the retaining memberto be tilted about the bolt 46 to a position corresponding to thatillustrated by dot and dash lines in Figure l. The portion 39 and theextension 44 will then be out of the path of the collar 30, and theworking implement may be freely removed from the front head. Afteranother drill steel has been inserted in the front head the retainingmember is again placed in the retaining position in which the surface 38seats upon the seating surface 31 whereit will be securely held by theplunger 48.

The foregoing described retainer comprises only a few simple parts whichmay be cheaply constructed and possess the desirable qualities ofdurability and simplicity of operation. By seating the retaining memberdirectly upon a portion of the front head the force of the impact ofthey working implement against the retainer will be applied only to.such elements as are best capable of withstanding it.

I claim:

1. In a steel retainer, comprising in combination with a front head anda working implement having a collar, an aperture in the front headadjacent the Working implement, a seating surface at one end of theaperture arranged perpendicular to the axis of the front head, aretaining member in the aperture seating upon the seating surface andextending into the path of the collar being slidable and tiltable intoand out of retaining positions, and means for pressing the retainingmember against the seating surface.

2. In a steel retainer, comprising in combination with a front head anda working implement having a collar, an aperture in the front headextending longitudinally thereof and having a flat seating surface atits front end arranged perpendicular to the axis of the front head, aretaining member slidable and tiltable in the aperture seating upon theseating surface, and a spring-pressed plunger to hold the retainingmember against the seating surface.

3. In a steel retainer, comprising in combination with a front head anda working implement having a collar, an aperture in the front headhaving a seating surface at its front end, a retaining member in theaperture seating upon the seating surface and being slidable andtiltable in the aperture into and out of retaining positions, a pivot inthe front head extending through the retaining member, and aspring-pressed plunger for holding the retaining member against theseating surface.

4. In a steel retainer, comprising in combination with a front head andworking implement having a collar, an aperture in the front head havinga seating surface at its front end, a retaining member in the apertureseating upon the seating surface and being slidable and tiltable in theaperture into and out of retaining positions, there being a slot in theretaining member, a pivot in the retaining member extending through theslot, a spring-pressed plunger in the front head to press the retainingmember against the seating surface, and a grip member on the retainingmember for manipulating said retaining member.

5. In a steel retainer, comprising in combination with a front head andworking implement having a collar, a seating surface in the front head,a retaining member in the front head se ating upon the seating surfaceand being slidable and tiltable into and out of retaining positions,yieldable means for pressing the retaining member against the seatingsurface, and means on the retaining member interlockingly engaging thefront head to. maintain the retaining member in retaining .position.

JOHN F. MOCK.

